Scatter plot brushing.
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September 18, 2016 19:52
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Scatter plot brushing
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <p id="g1"></p> | |
| <script> | |
| function randomData(samples) { | |
| var data = [], | |
| random = d3.randomNormal(); | |
| for (i = 0; i < samples; i++) { | |
| data.push({ | |
| x: random(), | |
| y: random() | |
| }); | |
| } | |
| return data; | |
| } | |
| var ds = randomData(300); | |
| var margin = { top: 20, right: 20, bottom: 30, left: 50 }; | |
| width = 800 - margin.left - margin.right, | |
| height = 400 - margin.top - margin.bottom; | |
| var x = d3.scaleLinear() | |
| .range([0, width]); | |
| var y = d3.scaleLinear() | |
| .range([height, 0]); | |
| var xAxis = d3.axisBottom(x).ticks(12), | |
| yAxis = d3.axisLeft(y).ticks(12 * height / width); | |
| var svg = d3.select("#g1").append("svg") | |
| .attr("id", "g1_svg") | |
| .attr("data-margin-right", margin.right) | |
| .attr("data-margin-left", margin.left) | |
| .attr("data-margin-top", margin.top) | |
| .attr("data-margin-bottom", margin.bottom) | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| x.domain(d3.extent(ds, function (d) { return d.x; })).nice(); | |
| y.domain(d3.extent(ds, function (d) { return d.y; })).nice(); | |
| svg.append("g") | |
| .attr("class", "x axis ") | |
| .attr('id', "axis--x") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .attr('id', "axis--y") | |
| .call(yAxis); | |
| var dot = svg.selectAll(".dot") | |
| .data(ds) | |
| .enter().append("circle") | |
| .attr("class", "dot") | |
| .attr("r", 5) | |
| .attr("cx", function (d) { return x(d.x); }) | |
| .attr("cy", function (d) { return y(d.y); }) | |
| .attr("opacity", 0.7) | |
| .style("fill", "#4292c6"); | |
| svg.append("g") | |
| .call(d3.brush().extent([[0, 0], [width, height]]).on("brush", brushed).on("end", brushended)); | |
| function brushed() { | |
| var s = d3.event.selection, | |
| x0 = s[0][0], | |
| y0 = s[0][1], | |
| dx = s[1][0] - x0, | |
| dy = s[1][1] - y0; | |
| // console.log(s); | |
| svg.selectAll('circle') | |
| .style("fill", function (d) { | |
| if (x(d.x) >= x0 && x(d.x) <= x0 + dx && y(d.y) >= y0 && y(d.y) <= y0 + dy) | |
| { return "#ec7014"; } | |
| else { return "#4292c6"; } | |
| }); | |
| } | |
| function brushended() { | |
| if (!d3.event.selection) { | |
| svg.selectAll('circle') | |
| .transition() | |
| .duration(150) | |
| .ease(d3.easeLinear) | |
| .style("fill", "#4292c6"); | |
| } | |
| } | |
| </script> | |
| </body> |
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